insulator
noun
in·su·la·tor
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Definition of insulator
: one that insulates: such as
a
: a material that is a poor conductor (as of electricity or heat) â compare semiconductor
b
: a device made of an electrical insulating material and used for separating or supporting conductors
Examples of insulator in a Sentence
Metal is not a good insulator.
Recent Examples on the Web
General admission costs $3, with early birds allowed at 8 a.m. for $15 to browse more than 60 dealer tables offering antique bottles, postcards, stoneware, glassware, fruit jars, insulators, advertising, and other collectibles. — BostonGlobe.com, "North Calendar: Whatâs happening this week," 5 Sep. 2019 This behavior is akin to a phase transition, the researchers said â like when a metal changes from a conductor to an insulator under certain conditions. — Quanta Magazine, "Strange Metal-like Bonds Discovered in Customized Crystals," 3 Sep. 2019 Electrical arching from faulty insulators has sparked several fires in the past, which cause major delays. — Erin Baldassari, The Mercury News, "Weekend BART work to add 40 minutes to some East Bay trips, close two lanes of Highway 24," 13 Aug. 2019 On the surface of a topological insulator, electrons flow smoothly, while on the inside, electrons are immobile. — Quanta Magazine, "âQuantum Atmospheresâ May Reveal Secrets of Matter," 25 Sep. 2018 As before, an electric field switched the device into an insulator. — David H. Freedman, WIRED, "Physicists Are Bewitched by Twisted Graphene's 'Magic Angle'," 5 May 2019 The team landed on silica aerogel, a 97 percent porous material that allows light through but is an insulator that slows the conduction of heat. — Jason Daley, Smithsonian, "This Material May Make Human Habitation on Mars Possible," 18 July 2019 Topological insulators are strange materials with insulated interiors but conductive surfaces. — Rachel Crowell, Scientific American, "Quirky Quantum Tunneling Observed," 9 July 2019 Placing it on a soft surface, like on a pillow, bed, couch, your lap or anything that will act as an insulator is a really bad idea. — Ken Colburn, azcentral, "How to tell if your MacBook is recalled, and what to do next if it is," 24 June 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insulator.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for insulator
insulator
noun
English Language Learners Definition of insulator
: a material that allows little or no heat, electricity, or sound to go into or out of something
See the full definition for insulator in the English Language Learners Dictionary
insulator
noun
in·su·la·tor
| \ Ëin-sÉ-ËlÄ-tÉr
\
\
Kids Definition of insulator
: a material (as rubber or glass) that is a poor conductor of electricity, heat, or sound
insulator
noun
in·su·la·tor
| \ Ëin(t)-sÉ-ËlÄt-Ér
\
\
Medical Definition of insulator
: a material that is used to provide insulation
also
: a device made of such material
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